Convicted felons are not allowed to vote in Texas until they finish out their full sentence.

A worker at the polling station Mason voted at initially flagged issues with the woman’s ballot, the Morning News reported. Her name was not on a list of registered voters, but an election judge allowed her to cast a provisional ballot instead.

In order to do so, Mason was required to sign an affidavit, which specified that the voter must not be a felon or must have served his or her full sentence in order to cast the ballot.